Texas woman has two sets of identical twins in one day - TODAY Health

Valentine’s day brought a very special delivery to Tressa and Manuel Montalvo of Houston: two sets of identical twins.

The quadruplets were conceived spontaneously, without the help of any fertility treatments or drugs – something that has a one in 70 million chance of happening, the hospital says. They were born at 31 weeks by Cesarean section to Tressa, who is 36, The Woman's Hospital of Texas in Houston says.